/* ==========================================================================
   Library View Stylesheet - Ultra-Clean, Modern & Compact Design
   ========================================================================== */

.library-container {
  max-width: 960px;
  margin: 0 auto;
  padding: 6px clamp(8px, 2vw, 16px) 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  animation: fadeIn 0.2s ease-out;
}

/* --------------------------------------------------------------------------
   1. Search & Action Top Bar
   -------------------------------------------------------------------------- */
.library-top-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
}

.library-search-wrapper {
  position: relative;
  flex: 1;
}

.library-search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted, #94a3b8);
  pointer-events: none;
  display: flex;
  align-items: center;
}

.library-search-input {
  width: 100%;
  height: 38px;
  padding: 0 32px 0 36px;
  background: var(--card-bg, #ffffff);
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 10px;
  color: var(--text-primary, #0f172a);
  font-size: 0.88rem;
  outline: none;
  transition: all 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
}

[data-theme="dark"] .library-search-input {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.1);
  color: #f1f5f9;
}

.library-search-input:focus {
  border-color: var(--primary, #6366f1);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

.btn-clear-search {
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(148, 163, 184, 0.2);
  border: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  color: var(--text-muted, #64748b);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.68rem;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-clear-search:hover {
  background: rgba(148, 163, 184, 0.4);
  color: var(--text-primary, #0f172a);
}

/* Compact Primary Study Button */
.btn-library-study-compact {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  height: 38px;
  border-radius: 10px;
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  border: none;
  font-weight: 700;
  font-size: 0.82rem;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.28);
  transition: all 0.2s ease;
  white-space: nowrap;
  flex-shrink: 0;
}

.btn-library-study-compact:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-library-study-compact:active {
  transform: scale(0.97);
}

/* --------------------------------------------------------------------------
   2. Modern 4-Dropdown Filter Grid (2x2 Mobile, 4-Col Desktop)
   -------------------------------------------------------------------------- */
.library-filter-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
  width: 100%;
}

@media (min-width: 640px) {
  .library-filter-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 8px;
  }
}

.filter-dropdown-card {
  position: relative;
  display: flex;
  align-items: center;
  height: 38px;
  padding: 0 24px 0 10px;
  background: var(--card-bg, #ffffff);
  border: 1.5px solid var(--border, #e2e8f0);
  border-radius: 10px;
  transition: all 0.2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
  min-width: 0;
  box-sizing: border-box;
  overflow: hidden;
}

[data-theme="dark"] .filter-dropdown-card {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.12);
}

.filter-dropdown-card:hover {
  border-color: var(--primary, #6366f1);
}

.filter-dropdown-card.active {
  background: rgba(99, 102, 241, 0.08);
  border-color: var(--primary, #6366f1);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.15);
}

[data-theme="dark"] .filter-dropdown-card.active {
  background: rgba(99, 102, 241, 0.2);
  border-color: #818cf8;
}

.filter-dropdown-icon {
  font-size: 0.95rem;
  margin-right: 6px;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.filter-dropdown-select {
  width: 100%;
  height: 100%;
  border: none;
  background: transparent;
  color: var(--text-primary, #0f172a);
  font-size: 0.82rem;
  font-weight: 600;
  font-family: inherit;
  cursor: pointer;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
  padding: 0;
  min-width: 0;
}

[data-theme="dark"] .filter-dropdown-select {
  color: #f1f5f9;
}

.filter-dropdown-select option {
  background: #ffffff;
  color: #0f172a;
  font-size: 0.82rem;
  padding: 6px 10px;
}

[data-theme="dark"] .filter-dropdown-select option {
  background: #1e2430;
  color: #f1f5f9;
}

.filter-dropdown-arrow {
  position: absolute;
  right: 7px;
  top: 50%;
  transform: translateY(-50%);
  pointer-events: none;
  color: var(--text-muted, #94a3b8);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease, color 0.2s ease;
}

.filter-dropdown-card:focus-within .filter-dropdown-arrow,
.filter-dropdown-card.active .filter-dropdown-arrow {
  color: var(--primary, #6366f1);
}

/* --------------------------------------------------------------------------
   3. Active Filter Tags Bar
   -------------------------------------------------------------------------- */
.library-active-tags-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 10px;
  background: rgba(99, 102, 241, 0.05);
  border: 1px dashed rgba(99, 102, 241, 0.25);
  border-radius: 10px;
  font-size: 0.76rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

[data-theme="dark"] .library-active-tags-bar {
  background: rgba(99, 102, 241, 0.1);
  border-color: rgba(99, 102, 241, 0.35);
}

.active-tags-title {
  font-weight: 700;
  color: var(--primary, #6366f1);
  white-space: nowrap;
  flex-shrink: 0;
}

.active-tags-list {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: nowrap;
}

.active-tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 8px;
  background: var(--card-bg, #ffffff);
  border: 1px solid rgba(99, 102, 241, 0.3);
  border-radius: 12px;
  color: var(--primary, #6366f1);
  font-weight: 600;
  font-size: 0.74rem;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
}

[data-theme="dark"] .active-tag-chip {
  background: #1e2430;
  border-color: rgba(99, 102, 241, 0.4);
  color: #a5b4fc;
}

.active-tag-chip:hover {
  background: rgba(239, 68, 68, 0.1);
  border-color: #ef4444;
  color: #ef4444;
}

.tag-chip-remove {
  font-size: 0.7rem;
  opacity: 0.7;
}

/* Reset Pill */
.btn-pill-reset {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 3px 8px;
  height: 24px;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid rgba(239, 68, 68, 0.3);
  border-radius: 12px;
  color: #ef4444;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-pill-reset:hover {
  background: rgba(239, 68, 68, 0.2);
  border-color: #ef4444;
}

/* --------------------------------------------------------------------------
   4. Meta Bar (Count & Page Size)
   -------------------------------------------------------------------------- */
.library-meta-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 2px 2px;
  font-size: 0.78rem;
  color: var(--text-muted, #64748b);
  gap: 6px;
  min-width: 0;
  width: 100%;
}

.library-results-summary {
  white-space: nowrap;
  flex-shrink: 0;
  font-size: 0.78rem;
}

.library-results-summary strong {
  color: var(--primary, #6366f1);
  font-weight: 700;
}

.results-summary-content {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-lib-reset-inline {
  display: inline-flex;
  align-items: center;
  gap: 3px;
  padding: 1px 7px;
  height: 22px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  border-radius: 6px;
  color: #ef4444;
  font-size: 0.72rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

.btn-lib-reset-inline:hover {
  background: rgba(239, 68, 68, 0.18);
  border-color: #ef4444;
}

[data-theme="dark"] .btn-lib-reset-inline {
  background: rgba(239, 68, 68, 0.16);
  border-color: rgba(239, 68, 68, 0.4);
  color: #fca5a5;
}

.filter-badge-keyword {
  background: rgba(99, 102, 241, 0.1);
  color: var(--primary, #6366f1);
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 4px;
}

.library-meta-right {
  display: flex;
  align-items: center;
  gap: 5px;
  flex-shrink: 0;
}

.meta-select-wrap {
  display: inline-flex;
  align-items: center;
}

.compact-meta-select {
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 6px;
  color: var(--text-secondary, #475569);
  font-size: 0.74rem;
  font-weight: 600;
  font-family: inherit;
  padding: 0 6px;
  height: 28px;
  outline: none;
  cursor: pointer;
  transition: all 0.15s ease;
  white-space: nowrap;
}

[data-theme="dark"] .compact-meta-select {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.12);
  color: #94a3b8;
}

.compact-meta-select:hover,
.compact-meta-select:focus {
  border-color: var(--primary, #6366f1);
  color: var(--text-primary, #0f172a);
}

[data-theme="dark"] .compact-meta-select:hover,
[data-theme="dark"] .compact-meta-select:focus {
  color: #f1f5f9;
}

.compact-meta-select option {
  background: #ffffff;
  color: #0f172a;
}

[data-theme="dark"] .compact-meta-select option {
  background: #1e2430;
  color: #f1f5f9;
}

.library-pagination-info {
  font-weight: 700;
  white-space: nowrap;
  font-size: 0.72rem;
  color: var(--text-muted, #64748b);
  background: rgba(148, 163, 184, 0.12);
  padding: 3px 6px;
  border-radius: 6px;
  line-height: 1;
}

[data-theme="dark"] .library-pagination-info {
  background: rgba(255, 255, 255, 0.08);
  color: #94a3b8;
}

/* --------------------------------------------------------------------------
   4. Vocabulary Words Rows List (Ultra-Clean, 1 Row, High-Density)
   -------------------------------------------------------------------------- */
.library-words-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-height: 200px;
}

.library-word-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  min-height: 52px;
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.02);
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  position: relative;
  outline: none;
  contain: layout style paint;
  content-visibility: auto;
  contain-intrinsic-size: 0 52px;
}

[data-theme="dark"] .library-word-row {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.08);
  box-shadow: none;
}

.library-word-row:hover {
  border-color: var(--primary, #6366f1);
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.08);
  background: #f8faff;
  transform: translateX(2px);
}

[data-theme="dark"] .library-word-row:hover {
  background: rgba(99, 102, 241, 0.04);
  border-color: rgba(99, 102, 241, 0.5);
}

/* Circular Sound Button */
.btn-row-sound {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(99, 102, 241, 0.08);
  color: var(--primary, #6366f1);
  border: 1px solid rgba(99, 102, 241, 0.18);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all 0.15s ease;
}

.btn-row-sound:hover {
  background: var(--primary, #6366f1);
  color: #ffffff;
  transform: scale(1.06);
}

.btn-row-sound.playing {
  background: var(--primary, #6366f1);
  color: #ffffff;
  animation: pulse 1s infinite;
}

/* Center Content */
.library-row-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.library-row-top-line {
  display: flex;
  align-items: baseline;
  gap: 6px;
  flex-wrap: nowrap;
  overflow: hidden;
}

.library-row-word {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--text-primary, #0f172a);
  white-space: nowrap;
}

[data-theme="dark"] .library-row-word {
  color: #f8fafc;
}

.library-row-ipa {
  font-size: 0.76rem;
  color: #8b5cf6;
  white-space: nowrap;
  opacity: 0.85;
}

[data-theme="dark"] .library-row-ipa {
  color: #a78bfa;
}

/* Mini CEFR Badge */
.badge-cefr-mini {
  font-size: 0.62rem;
  font-weight: 800;
  padding: 1px 4px;
  border-radius: 3px;
  text-transform: uppercase;
  background: #10b981;
  color: #ffffff;
  line-height: 1.15;
  flex-shrink: 0;
}

.badge-cefr-mini[data-cefr="a1"] { background: #10b981; }
.badge-cefr-mini[data-cefr="a2"] { background: #059669; }
.badge-cefr-mini[data-cefr="b1"] { background: #6366f1; }
.badge-cefr-mini[data-cefr="b2"] { background: #8b5cf6; }
.badge-cefr-mini[data-cefr="c1"] { background: #ec4899; }

/* Short POS Text (italic, refined, no boxy clutter) */
.library-pos-text {
  font-size: 0.72rem;
  font-weight: 600;
  font-style: italic;
  color: var(--text-muted, #64748b);
  white-space: nowrap;
  flex-shrink: 0;
}

[data-theme="dark"] .library-pos-text {
  color: #94a3b8;
}

.library-row-meaning {
  font-size: 0.8rem;
  color: var(--text-secondary, #475569);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.25;
}

[data-theme="dark"] .library-row-meaning {
  color: #94a3b8;
}

/* Right Status Pill */
.library-row-end {
  display: flex;
  align-items: center;
  gap: 4px;
  flex-shrink: 0;
}

.library-status-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 7px;
  border-radius: 10px;
  font-size: 0.72rem;
  font-weight: 600;
  white-space: nowrap;
}

.status-dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
}

.library-status-badge.status-due {
  background: rgba(239, 68, 68, 0.12);
  color: #ef4444;
}
.library-status-badge.status-due .status-dot { background: #ef4444; }

.library-status-badge.status-new {
  background: rgba(148, 163, 184, 0.12);
  color: #64748b;
}
.library-status-badge.status-new .status-dot { background: #94a3b8; }

.library-status-badge.status-learning {
  background: rgba(16, 185, 129, 0.12);
  color: #10b981;
}
.library-status-badge.status-learning .status-dot { background: #10b981; }

.library-status-badge.status-mastered {
  background: rgba(139, 92, 246, 0.12);
  color: #8b5cf6;
}
.library-status-badge.status-mastered .status-dot { background: #8b5cf6; }

.library-chevron-icon {
  color: var(--text-muted, #94a3b8);
  opacity: 0.6;
}

/* Empty State */
.library-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 40px 16px;
  text-align: center;
  background: var(--card-bg, #ffffff);
  border: 1px dashed var(--border, #e2e8f0);
  border-radius: 12px;
}

[data-theme="dark"] .library-empty-state {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.1);
}

.library-empty-icon {
  font-size: 2rem;
  margin-bottom: 8px;
}

.library-empty-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  margin: 0 0 4px;
}

.library-empty-desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.btn-clear-empty-filter {
  padding: 6px 14px;
  background: var(--primary, #6366f1);
  color: #ffffff;
  border: none;
  border-radius: 8px;
  font-size: 0.8rem;
  font-weight: 700;
  cursor: pointer;
}

/* --------------------------------------------------------------------------
   5. Bottom Pagination Bar
   -------------------------------------------------------------------------- */
.library-pagination-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 0;
}

.btn-page-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  height: 32px;
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.78rem;
  font-weight: 700;
  cursor: pointer;
  transition: all 0.15s ease;
}

[data-theme="dark"] .btn-page-nav {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.1);
}

.btn-page-nav:hover:not(:disabled) {
  border-color: var(--primary, #6366f1);
  color: var(--primary, #6366f1);
}

.btn-page-nav:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.pagination-pages-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.btn-page-num {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--card-bg, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  color: var(--text-primary);
  font-size: 0.78rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.15s ease;
}

[data-theme="dark"] .btn-page-num {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.1);
}

.btn-page-num:hover {
  border-color: var(--primary, #6366f1);
  color: var(--primary, #6366f1);
}

.btn-page-num.active {
  background: var(--primary, #6366f1);
  border-color: var(--primary, #6366f1);
  color: #ffffff;
  box-shadow: 0 2px 6px rgba(99, 102, 241, 0.3);
}

.pagination-ellipsis {
  padding: 0 4px;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* --------------------------------------------------------------------------
   6. Word Detail Modal (Full Popup)
   -------------------------------------------------------------------------- */
.word-detail-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(6px);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  opacity: 0;
  visibility: hidden;
  transition: all 0.25s ease;
}

.word-detail-modal-overlay.active {
  opacity: 1;
  visibility: visible;
}

.word-detail-dialog {
  background: var(--bg-primary, #ffffff);
  border: 1px solid var(--border, #e2e8f0);
  border-radius: 16px;
  width: 100%;
  max-width: 520px;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.25);
  transform: scale(0.95);
  transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

[data-theme="dark"] .word-detail-dialog {
  background: #0f141c;
  border-color: rgba(255, 255, 255, 0.1);
}

.word-detail-modal-overlay.active .word-detail-dialog {
  transform: scale(1);
}

.word-detail-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border, #e2e8f0);
}

[data-theme="dark"] .word-detail-header {
  border-bottom-color: rgba(255, 255, 255, 0.08);
}

.word-detail-header-tags {
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-detail-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-detail-close:hover {
  background: rgba(148, 163, 184, 0.15);
  color: var(--text-primary);
}

.word-detail-body {
  padding: 16px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.word-detail-hero {
  display: flex;
  align-items: center;
  gap: 14px;
}

.word-detail-image-wrap {
  width: 80px;
  height: 80px;
  border-radius: 12px;
  overflow: hidden;
  flex-shrink: 0;
  border: 1px solid var(--border, #e2e8f0);
}

.word-detail-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.word-detail-headline {
  flex: 1;
}

.word-detail-title {
  margin: 0;
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-primary);
}

.word-detail-ipa {
  font-family: 'JetBrains Mono', monospace;
  font-size: 0.9rem;
  color: #8b5cf6;
  margin: 2px 0 8px;
}

.word-detail-audio-row {
  display: flex;
  gap: 6px;
}

.btn-modal-sound {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: 8px;
  font-size: 0.74rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid rgba(99, 102, 241, 0.3);
  background: rgba(99, 102, 241, 0.08);
  color: var(--primary, #6366f1);
  transition: all 0.15s ease;
}

.btn-modal-sound:hover {
  background: var(--primary, #6366f1);
  color: #ffffff;
}

.word-detail-section {
  padding: 12px;
  background: rgba(148, 163, 184, 0.06);
  border-radius: 10px;
  border: 1px solid var(--border, #e2e8f0);
}

[data-theme="dark"] .word-detail-section {
  background: rgba(255, 255, 255, 0.02);
  border-color: rgba(255, 255, 255, 0.06);
}

.section-label {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.word-detail-meaning-text {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-primary);
}

.def-label {
  margin-top: 8px;
}

.word-detail-def-text {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.word-detail-example-en {
  font-size: 0.88rem;
  font-style: normal;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.word-detail-example-vi {
  font-size: 0.82rem;
  color: var(--text-muted);
}

/* FSRS Analytics Grid in Modal */
.fsrs-box-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.fsrs-box-title {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 4px;
}

.fsrs-tier-pill {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 8px;
  border-radius: 10px;
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary, #6366f1);
}

.fsrs-stats-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 6px;
}

.fsrs-stat-item {
  background: var(--card-bg, #ffffff);
  padding: 6px 8px;
  border-radius: 6px;
  border: 1px solid var(--border, #e2e8f0);
}

[data-theme="dark"] .fsrs-stat-item {
  background: #161b22;
  border-color: rgba(255, 255, 255, 0.06);
}

.fsrs-stat-label {
  font-size: 0.68rem;
  color: var(--text-muted);
}

.fsrs-stat-value {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--text-primary);
}

.word-detail-footer {
  padding: 12px 16px;
  border-top: 1px solid var(--border, #e2e8f0);
}

[data-theme="dark"] .word-detail-footer {
  border-top-color: rgba(255, 255, 255, 0.08);
}

.btn-modal-study-now {
  width: 100%;
  height: 40px;
  background: linear-gradient(135deg, #6366f1 0%, #4f46e5 100%);
  color: #ffffff;
  border: none;
  border-radius: 10px;
  font-size: 0.88rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  box-shadow: 0 2px 8px rgba(99, 102, 241, 0.3);
}

.btn-modal-study-now:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.45);
}